CVE-2024-27414

MEDIUM
Published May 17, 2024 Modified Dec 17, 2025

Description

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic in the function `rtnl_bridge_setlink` to enable the loop to also check the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment removed the `break` statement and led to an error logic of the flags writing back at the end of this function. if (have_flags) memcpy(nla_data(attr), &flags, sizeof(flags)); // attr should point to IFLA_BRIDGE_FLAGS NLA !!! Before the mentioned commit, the `attr` is granted to be IFLA_BRIDGE_FLAGS. However, this is not necessarily true fow now as the updated loop will let the attr point to the last NLA, even an invalid NLA which could cause overflow writes. This patch introduces a new variable `br_flag` to save the NLA pointer that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned error logic.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
debian debian_linux

References

Advisories & Patches

https://git.kernel.org/stable/c/167d8642daa6a44b51de17f8ff0f584e1e762db7 https://git.kernel.org/stable/c/743ad091fb46e622f1b690385bb15e3cd3daf874 https://git.kernel.org/stable/c/831bc2728fb48a8957a824cba8c264b30dca1425 https://git.kernel.org/stable/c/882a51a10ecf24ce135d573afa0872aef02c5125 https://git.kernel.org/stable/c/a1227b27fcccc99dc44f912b479e01a17e2d7d31 https://git.kernel.org/stable/c/b9fbc44159dfc3e9a7073032752d9e03f5194a6f https://git.kernel.org/stable/c/f2261eb994aa5757c1da046b78e3229a3ece0ad9 https://git.kernel.org/stable/c/167d8642daa6a44b51de17f8ff0f584e1e762db7 https://git.kernel.org/stable/c/743ad091fb46e622f1b690385bb15e3cd3daf874 https://git.kernel.org/stable/c/831bc2728fb48a8957a824cba8c264b30dca1425 https://git.kernel.org/stable/c/882a51a10ecf24ce135d573afa0872aef02c5125 https://git.kernel.org/stable/c/a1227b27fcccc99dc44f912b479e01a17e2d7d31 https://git.kernel.org/stable/c/b9fbc44159dfc3e9a7073032752d9e03f5194a6f https://git.kernel.org/stable/c/f2261eb994aa5757c1da046b78e3229a3ece0ad9

Frequently Asked Questions

What is CVE-2024-27414? +
In the Linux kernel, the following vulnerability has been resolved: rtnetlink: fix error logic of IFLA_BRIDGE_FLAGS writing back In the commit d73ef2d69c0d ("rtnetlink: let rtnl_bridge_setlink checks IFLA_BRIDGE_MODE length"), an adjustment was made to the old loop logic in the function `rtnl_bridge_setlink` to enable the loop to also check the length of the IFLA_BRIDGE_MODE attribute. However, this adjustment removed the `break` statement and led to an error logic of the flags writing back at the end of this function. if (have_flags) memcpy(nla_data(attr), &flags, sizeof(flags)); // attr should point to IFLA_BRIDGE_FLAGS NLA !!! Before the mentioned commit, the `attr` is granted to be IFLA_BRIDGE_FLAGS. However, this is not necessarily true fow now as the updated loop will let the attr point to the last NLA, even an invalid NLA which could cause overflow writes. This patch introduces a new variable `br_flag` to save the NLA pointer that points to IFLA_BRIDGE_FLAGS and uses it to resolve the mentioned error logic. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2024-27414? +
CVE-2024-27414 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2024-27414? +
CVE-2024-27414 affects products from debian, linux, specifically: debian_linux, linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2024-27414? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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